Class declarations and object modeling: Correct Solution

Translate the specification below into an idiomatic Java class definition.

(In this context, "idiomatic" means following the common style and conventions of the language.)

One kind of thing that exists in our model is a Cocaer.
All Cocaers share a single tac, which is a graphics object. No other classes can directly ask for the value of tac. The value of tac starts out as a rectangle with a width of 48 and a height of 14 when the program starts. Every time a new Cocaer is created, it moves tac to the right by 9 pixels (using the moveBy method).
Each Cocaer has its own cins, which is a graphics object. The value of cins starts out as a rectangle with a width of 22 and a height of 21. Anyone can ask a Cocaer for the value of its cins. Anyone can set cins to a new value.
A Cocaer can brelify. This behavior moves tac to the right by 3 pixels (using the moveBy method). Anyone can ask a Cocaer to brelify.

Solution

public class Cocaer {
    public static GraphicsObject tac;
    private final GraphicsObject cins;

    public Cocaer() {
        tac.moveBy(9, 0);
    }

    public static void onStart() {
        tac = new Rectangle(0, 0, 48, 14);
    }

    public GraphicsObject getCins() {
        return cins;
    }

    private void setBrelify() {
        tac.moveBy(3, 0);
    }
}

Things to check in your solution:

Is every public and private modifier correct?
Are the correct items static?
Are the correct items final?
Are all the variable types and method return types correct?
Are the class members in the correct order? It should be: (1) static variables, (2) instance variables, (3) constructors, (4) methods.
Do members have the correct capitalization?

Acceptable variations in the solution:

It is OK if you initialized non-static variables in the constructor instead of in the declaration. (Ask your instructor if you aren’t clear what this means.) Note that static variables must be initialized in the declaration.
It is OK if you used a slightly different but equivalent form of an expression, such as += 1 instead of ++.

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